Regioselective Synthesis of 5-Alkylsalicylates, 5-Alkyl-2-hydroxy-acetophenones, and 5-Alkyl-2-hydroxy-benzophenones by [3 + 3] Cyclization of 1,3-Bis(silyl enol ethers) with 2-Alkyl-1,1,3,3-tetraethoxypropanes
作者:Constantin Mamat、Stefan Büttner、Tiana Trabhardt、Christine Fischer、Peter Langer
DOI:10.1021/jo070847e
日期:2007.8.1
A variety of 5-alkylsalicylates, 5-alkyl-2-hydroxy-acetophenones, and 5-alkyl-2-hydroxy-benzophenones was regioselectively prepared by TiCl4 mediated formal [3 + 3] cyclization of 1,3-bis(silyl enol ethers) with 2-alkyl-1,1,3,3-tetraethoxypropanes.
通过TiCl 4介导的1,3-双(甲硅烷基烯醇)的正式[3 + 3]环化反应,选择性地制备了各种5-烷基水杨酸酯,5-烷基-2-羟基苯乙酮和5-烷基-2-羟基苯甲酮醚)与2-烷基-1,1,3,3-四乙氧基丙烷。